CN115963602A - Polarization-maintaining optical fiber circulator - Google Patents
Polarization-maintaining optical fiber circulator Download PDFInfo
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- CN115963602A CN115963602A CN202211674617.2A CN202211674617A CN115963602A CN 115963602 A CN115963602 A CN 115963602A CN 202211674617 A CN202211674617 A CN 202211674617A CN 115963602 A CN115963602 A CN 115963602A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 51
- 230000010287 polarization Effects 0.000 claims abstract description 64
- 239000000835 fiber Substances 0.000 claims description 66
- 239000011521 glass Substances 0.000 claims description 19
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Abstract
The invention discloses a polarization-maintaining optical fiber circulator, which comprises a first port, a second port, a third port, a first optical fiber connector, a second optical fiber connector, a third optical fiber connector, a first polarization-maintaining optical fiber collimator, a second polarization-maintaining optical fiber collimator, a third polarization-maintaining optical fiber collimator, a linear array beam splitter and a polarization reflection module, wherein the first optical fiber connector is connected with the first polarization-maintaining optical fiber collimator; has the advantages of simple structure and low cost.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a polarization-maintaining optical fiber circulator.
Background
A fiber optic circulator is a multi-port optical device that functions to allow optical signals to be transmitted only along a specified port sequence. Taking a three-port circulator as an example, when an optical signal is input from a predetermined port, the optical signal can be transmitted only in a predetermined order in the optical circulator (1 → 2,2 → 3), and when the transmission order of the optical signal is changed (for example, 2 → 1,3 → 2, etc.), the loss is large, and isolation of the signal can be realized by this characteristic. Due to the characteristics of high isolation and small insertion loss, the optical fiber circulator is widely applied to the fields of optical communication and optical sensing.
The polarization-maintaining fiber circulator is applied to the polarization-maintaining field, such as a high-speed fiber transmission system or Raman pumping application, a double-pass amplifier, a dispersion compensator and the like. The existing polarization-maintaining optical fiber circulator has many internal elements, mainly comprises a polarizer, a Faraday rotator, a half glass sheet, an analyzer, a collimator and the like, and has complex optical path coupling and high cost.
Disclosure of Invention
In view of this, the present invention provides a polarization maintaining fiber circulator, which includes a first port, a second port, a third port, a first fiber connector, a second fiber connector, a third fiber connector, a first polarization maintaining fiber collimator, a second polarization maintaining fiber collimator, a third polarization maintaining fiber collimator, a linear beam splitter, and a polarization reflecting module;
the tail end of the first polarization-maintaining optical fiber collimator is connected with a first optical fiber connector, the tail end of the second polarization-maintaining optical fiber collimator is connected with a second optical fiber connector, and the tail end of the third polarization-maintaining optical fiber collimator is connected with a third optical fiber connector;
the first port is located at a first fiber optic connector, the second port is located at a second fiber optic connector, and the third port is located at a third fiber optic connector;
incident P polarized light enters from the first port, becomes collimated light through the first polarization maintaining fiber collimator and enters the polarization beam splitter, the collimated P polarized light is horizontally emitted, the P polarized light is converted into S polarized light through the polarization reflection module, the converted S polarized light exits through the polarization beam splitter, enters the second polarization maintaining fiber collimator and is coupled, enters the optical fiber and is output from the second port;
incident P polarized light enters from the second port, becomes collimated light through the second polarization-maintaining optical fiber collimator and enters the polarization beam splitter, the collimated P polarized light is horizontally emitted, enters the third polarization-maintaining optical fiber collimator for coupling, enters the optical fiber and is output from the third port;
incident S polarized light enters from the third port, becomes collimated light through the third polarization-maintaining fiber collimator and enters the polarization beam splitter, the collimated S polarized light is vertically emitted, enters the first polarization-maintaining fiber collimator for coupling, enters the optical fiber and is output from the first port.
Further, the polarized reflection module comprises two parts, namely a 1/4 glass slide and a reflector.
Further, the polarization reflection module comprises two parts of a Faraday rotation mirror and a reflection mirror.
Furthermore, the first optical fiber connector, the second optical fiber connector and the third optical fiber connector are all APC optical fiber connectors, and an end face of the APC optical fiber connector forms an octave.
The technical scheme provided by the invention has the following beneficial effects:
compared with the existing polarization maintaining optical fiber circulator which uses a plurality of optical devices such as birefringent crystals, faraday rotators, 1/2 glass slides, collimators and the like, the polarization maintaining optical fiber circulator provided by the invention has the advantages of simple structure and low cost.
Drawings
FIG. 1 is a block diagram and an optical path diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a block diagram and an optical path diagram of an embodiment of the present invention.
An embodiment of the present invention provides a polarization maintaining fiber circulator, including: the polarization maintaining fiber collimator comprises a first port, a second port, a third port, a first fiber connector, a second fiber connector, a third fiber connector, a first polarization maintaining fiber collimator, a second polarization maintaining fiber collimator, a third polarization maintaining fiber collimator, a linear array beam splitter (PBS) and a polarization reflection module.
The polarized reflection module comprises a 1/4 glass slide and a reflector, wherein P polarized light vertically enters the 1/4 glass slide, and the polarization direction of the light forms an angle of 45 degrees with the optical axis plane of the glass slide.
The polarization reflecting module can also be replaced by a Faraday rotator mirror and a reflector.
First fiber connector, second fiber connector, third fiber connector are APC fiber connector, and APC fiber connector's terminal surface becomes the octave that inclines, and its effect is in order to reduce the reverberation, guarantees device return loss.
The tail end of the first polarization maintaining optical fiber collimator is connected with the first optical fiber connector, the tail end of the second polarization maintaining optical fiber collimator is connected with the second optical fiber connector, and the tail end of the third polarization maintaining optical fiber collimator is connected with the third optical fiber connector.
The first port is located at the first fiber optic connector, the second port is located at the second fiber optic connector, and the third port is located at the third fiber optic connector.
The polarization maintaining fiber collimator is used to collimate input light, and generally uses a G-lens single-mode fiber collimator, the insertion loss is less than or equal to 0.3dB, and the working distance is 20mm.
The polarization beam splitter is used for splitting polarization-independent incident light into two paths of orthogonal polarized light P polarized light and S polarized light. Extinction ratio Tp: ts is more than 1000 (most of light is Tp polarized light), tp transmittance is more than 95%, and Ts reflectivity is more than 99.5%. When the incident light is P polarized light, the incident light is emitted horizontally, and when the incident light is S polarized light, the incident light is emitted vertically at 90 degrees.
The function of the 1/4 glass slide is that when linearly polarized light is vertically incident on the 1/4 glass slide, the polarization direction of the light forms an angle theta with the optical axis plane of the glass slide, and after the light is emitted, the light becomes elliptically polarized light, and particularly when the angle theta =45 degrees, the emitted light is circularly polarized light. In this embodiment, θ is 45 °, that is, the emitted light is circularly polarized light. When circularly polarized light is perpendicularly incident on a 1/4 glass slide and the polarization direction of the light makes an angle of 45 DEG with the optical axis plane of the glass slide, the circularly polarized light after emergence becomes linearly polarized light.
In this embodiment, the reflector is a dielectric film reflector, and Tp reflectivity is greater than 99%, and Ts reflectivity is greater than 99%.
The combined use of the 1/4 glass slide and the reflector has the following functions: the P polarized light passes through the 1/4 glass slide with an included angle of 45 degrees to be changed into circularly polarized light, the 1/4 glass slide has reciprocity, the rotation directions of the polarization states are opposite in forward transmission and reverse transmission, the circularly polarized light is changed into circularly polarized light with the opposite direction after passing through the reflector, the circularly polarized light passes through the 1/4 glass slide to be changed into S polarized light orthogonal to the incident light, and the S polarized light enters the second port after passing through the polarization beam splitter.
Referring to fig. 1, fig. 1 is a block diagram and an optical path diagram of an embodiment of the present invention.
In this embodiment, the optical path from the first port to the second port is: incident P polarized light enters from the first port, becomes collimated light through the first polarization maintaining fiber collimator and enters the polarization beam splitter, the collimated P polarized light is horizontally emitted, and the P polarized light is converted into S polarized light through the polarization reflection module. When the polarization reflection module uses a Faraday rotation mirror and a reflector, P polarized light which is collimated and horizontally emitted by the polarization beam splitter passes through the Faraday rotation mirror, the polarization direction of the P polarized light rotates by 45 degrees, the P polarized light enters the Faraday rotation mirror after being reflected by the reflector, and the polarization direction of the P polarized light rotates by 45 degrees again, namely the P polarized light is changed into S polarized light; when the polarization reflection module uses two parts of a 1/4 glass slide and a reflector, P polarized light which is collimated and horizontally emitted by the polarization beam splitter passes through the 1/4 glass slide, the P polarized light becomes circularly polarized light, the circularly polarized light is reflected by the reflector to become circularly polarized light with opposite direction, and the circularly polarized light with opposite direction enters the 1/4 glass slide again to become S polarized light. The converted S polarized light is emitted after passing through the polarization beam splitter, coupled into the optical fiber at the second polarization-maintaining optical fiber collimator, and output from the second port.
In this embodiment, the optical path from the second port to the third port is: incident P polarized light is emitted from the second port, becomes collimated light through the second polarization-maintaining fiber collimator and then enters the polarization beam splitter, the collimated P polarized light is horizontally emitted out, and the collimated P polarized light enters the optical fiber after being coupled by the third polarization-maintaining fiber collimator and is output from the third port.
In this embodiment, the optical path from the third port to the first port is: incident S polarized light enters from the third port, becomes collimated light through the third polarization-maintaining fiber collimator and enters the polarization beam splitter, the collimated S polarized light is vertically emitted, enters the optical fiber after being coupled by the first polarization-maintaining fiber collimator and is output from the first port.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments of the invention will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A polarization maintaining fiber circulator, comprising: the polarization maintaining fiber optic fiber collimator comprises a first port, a second port, a third port, a first fiber optic connector, a second fiber optic connector, a third fiber optic connector, a first polarization maintaining fiber collimator, a second polarization maintaining fiber collimator, a third polarization maintaining fiber collimator, a linear array beam splitter and a polarization reflecting module;
the tail end of the first polarization-maintaining optical fiber collimator is connected with a first optical fiber connector, the tail end of the second polarization-maintaining optical fiber collimator is connected with a second optical fiber connector, and the tail end of the third polarization-maintaining optical fiber collimator is connected with a third optical fiber connector;
the first port is located at a first fiber optic connector, the second port is located at a second fiber optic connector, and the third port is located at a third fiber optic connector;
incident P polarized light enters from the first port, becomes collimated light through the first polarization maintaining fiber collimator and enters the polarization beam splitter, the collimated P polarized light is horizontally emitted, the P polarized light is converted into S polarized light through the polarization reflection module, the converted S polarized light exits through the polarization beam splitter, enters the second polarization maintaining fiber collimator for coupling, enters the optical fiber and is output from the second port;
incident P polarized light is emitted from the second port, becomes collimated light through the second polarization-maintaining fiber collimator and then enters the polarization beam splitter, the collimated P polarized light is horizontally emitted out, enters the third polarization-maintaining fiber collimator for coupling, then enters the optical fiber and is output from the third port;
incident S polarized light enters from the third port, becomes collimated light through the third polarization-maintaining fiber collimator and enters the polarization beam splitter, the collimated S polarized light is vertically emitted, enters the first polarization-maintaining fiber collimator for coupling, enters the optical fiber and is output from the first port.
2. The polarization maintaining fiber circulator of claim 1, wherein said polarization reflecting module comprises two parts, namely a 1/4 glass slide and a mirror.
3. The polarization maintaining fiber circulator of claim 1, wherein said polarization reflecting means comprises two portions of a faraday rotator mirror and a reflector mirror.
4. The polarization maintaining fiber circulator of claim 1, wherein each of the first fiber connector, the second fiber connector, and the third fiber connector is an APC fiber connector, and wherein an end face of the APC fiber connector is angled by eight degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211674617.2A CN115963602A (en) | 2022-12-26 | 2022-12-26 | Polarization-maintaining optical fiber circulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211674617.2A CN115963602A (en) | 2022-12-26 | 2022-12-26 | Polarization-maintaining optical fiber circulator |
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| CN115963602A true CN115963602A (en) | 2023-04-14 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6332054B1 (en) * | 1999-09-09 | 2001-12-18 | Nec Corporation | Dispersion compensation apparatus |
| CN108132500A (en) * | 2018-01-30 | 2018-06-08 | 福建天蕊光电有限公司 | A kind of closed loop optical circulator |
| CN108205173A (en) * | 2016-12-19 | 2018-06-26 | 陈佩娟 | A kind of miniaturization optical circulator |
| CN209356770U (en) * | 2019-03-08 | 2019-09-06 | 中国电子科技集团公司电子科学研究院 | Polarize unrelated phasing device |
| CN209657023U (en) * | 2019-04-02 | 2019-11-19 | 桂林光隆光学科技有限公司 | A kind of superminiature optical circulator |
| CN111522155A (en) * | 2020-05-07 | 2020-08-11 | 珠海光库科技股份有限公司 | Four-port polarization-related optical circulator |
| CN215575639U (en) * | 2021-08-03 | 2022-01-18 | 深圳市镭神智能系统有限公司 | Polarization-maintaining optical circulator and laser radar |
| CN114964203A (en) * | 2022-08-01 | 2022-08-30 | 中国船舶重工集团公司第七0七研究所 | Depolarization method and system for hollow-core microstructure fiber optic gyroscope |
| CN115014318A (en) * | 2022-08-08 | 2022-09-06 | 中国船舶重工集团公司第七0七研究所 | Hollow microstructure optical fiber gyroscope |
-
2022
- 2022-12-26 CN CN202211674617.2A patent/CN115963602A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6332054B1 (en) * | 1999-09-09 | 2001-12-18 | Nec Corporation | Dispersion compensation apparatus |
| CN108205173A (en) * | 2016-12-19 | 2018-06-26 | 陈佩娟 | A kind of miniaturization optical circulator |
| CN108132500A (en) * | 2018-01-30 | 2018-06-08 | 福建天蕊光电有限公司 | A kind of closed loop optical circulator |
| CN209356770U (en) * | 2019-03-08 | 2019-09-06 | 中国电子科技集团公司电子科学研究院 | Polarize unrelated phasing device |
| CN209657023U (en) * | 2019-04-02 | 2019-11-19 | 桂林光隆光学科技有限公司 | A kind of superminiature optical circulator |
| CN111522155A (en) * | 2020-05-07 | 2020-08-11 | 珠海光库科技股份有限公司 | Four-port polarization-related optical circulator |
| CN215575639U (en) * | 2021-08-03 | 2022-01-18 | 深圳市镭神智能系统有限公司 | Polarization-maintaining optical circulator and laser radar |
| CN114964203A (en) * | 2022-08-01 | 2022-08-30 | 中国船舶重工集团公司第七0七研究所 | Depolarization method and system for hollow-core microstructure fiber optic gyroscope |
| CN115014318A (en) * | 2022-08-08 | 2022-09-06 | 中国船舶重工集团公司第七0七研究所 | Hollow microstructure optical fiber gyroscope |
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